PARENTAL ALCOHOLISM AND THE PROGENY 295 



offspring of untreated parents of the same breeds mated in the 

 same way. This is true of both sexes. 



8. In the case of the male chickens there was no substantial 

 difference in the rate of growth in the three lots until after an 

 age of about 100 days was passed. From that point on the male 

 offspring of treated cf cJ' X untreated and treated 9 9 grew 

 at a more rapid rate than the controls. The differences in mean 

 body weight for a given age became increasingly large as the 

 age advanced. 



9. In the case of the female chickens there was no substantial 

 difference in the rate of growth in the three lots until after an 

 age of about 150 days was passed. During the next 25 days 

 the controls grew faster than the chicks from treated parents. 

 At and after 200 days of age, however, the offspring of treated 

 parents (one and both) showed a higher mean body weight than 

 the controls. 



10. At all ages in the case of the male chicks, and in all ages 

 but two (12.5 and 19.5 days) in the case of the female chicks, 

 the mean body weight of the offspring having both parents alco- 

 holic was higher than that of the offspring having one parent 

 only, the father, alcohoUc. 



11. The proportion of abnormal chicks produced from treated 

 parents was no greater than that produced from untreated 

 parents. 



12. The normal Mendelian inheritance was in no way affected 

 by the treatment of the parents, so far as concerns any of the 

 numerous characters observed and tested. This statement ap- 

 plies only to phenomena of dominance, recessiveness and sex 

 linkage. Other Mendelian phenomena have not as yet been 

 tested in these experiments. 



13. There was no evidence from these experiments that the 

 treatment of individual fowls, w^hether male or female, with 

 either ethyl alcohol, methyl alcohol, or ether, had any dele- 

 terious effect upon those germ cells which formed zygotes. The 

 treatment rendered many germ cells incapable of forming zygotes 

 at all, but those which did form zygotes had plainly not been 

 injured in any way. 



